USN-8975-1: libsoup2.4, libsoup3 vulnerabilities

Published Nov 3, 2026
·
Updated

It was discovered that libsoup incorrectly handled certain WebSocket frames. A remote attacker could possibly use this issue to cause an application to crash or expose sensitive information. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, Ubuntu 26.04 LTS, and Ubuntu 26.10. (CVE-2026-12478)

It was discovered that libsoup incorrectly handled certain data URIs. A remote attacker could possibly use this issue to cause an application to crash or expose sensitive information. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, Ubuntu 26.04 LTS, and Ubuntu 26.10. (CVE-2026-102555)

It was discovered that libsoup incorrectly handled certain WebSocket messages. A remote attacker could possibly use this issue to cause an application to crash. This issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, Ubuntu 26.04 LTS, and Ubuntu 26.10. (CVE-2026-102556)

It was discovered that libsoup incorrectly handled fragmented WebSocket messages. A remote attacker could possibly use this issue to cause an application to crash. (CVE-2026-102557)

It was discovered that libsoup incorrectly handled certain WebSocket frames. A remote attacker could possibly use this issue to cause an application to crash. This issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, Ubuntu 26.04 LTS, and Ubuntu 26.10. (CVE-2026-102558)

It was discovered that libsoup incorrectly handled large WebSocket messages. An attacker could possibly use this issue to cause an application to crash. (CVE-2026-102559)

It was discovered that libsoup incorrectly handled compressed WebSocket messages. An attacker could possibly use this issue to cause an application to crash. This issue only affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, Ubuntu 26.04 LTS, and Ubuntu 26.10. (CVE-2026-102560)

It was discovered that libsoup did not properly handle certain HTTP requests. A remote attacker could possibly use this issue to inject arbitrary HTTP requests. (CVE-2026-103399)

It was discovered that libsoup incorrectly handled proxy credentials. A remote attacker could possibly use this issue to obtain sensitive information. (CVE-2026-12547)

It was discovered that libsoup incorrectly handled multipart messages. A remote attacker could possibly use this issue to cause an application to crash or obtain sensitive information. (CVE-2026-12548)

Affected Software

108 affected componentsFixes available
ubuntu/libsoup2.4<2.52.2-1ubuntu0.3+esm9
2.52.2-1ubuntu0.3+esm9
ubuntu/libsoup2.4<2.62.1-1ubuntu0.4+esm10
2.62.1-1ubuntu0.4+esm10
ubuntu/libsoup2.4<2.70.0-1ubuntu0.5+esm5
2.70.0-1ubuntu0.5+esm5
ubuntu/libsoup2.4<2.74.2-3ubuntu0.10
2.74.2-3ubuntu0.10
ubuntu/libsoup3<3.0.7-0ubuntu1+esm10
3.0.7-0ubuntu1+esm10
ubuntu/libsoup2.4<2.74.3-6ubuntu1.10
2.74.3-6ubuntu1.10
ubuntu/libsoup3<3.4.4-5ubuntu0.10
3.4.4-5ubuntu0.10
ubuntu/libsoup3<3.6.6-1ubuntu3.1
3.6.6-1ubuntu3.1
ubuntu/libsoup3<3.6.6-1ubuntu0.2
3.6.6-1ubuntu0.2
ubuntu/libsoup2.4<2.74.3-10.1ubuntu5+esm4
2.74.3-10.1ubuntu5+esm4
All of the following
ubuntu/gir1.2-soup-3.0<3.6.6-1ubuntu3.1
3.6.6-1ubuntu3.1
Ubuntu Ubuntu=26.10
All of the following
ubuntu/libsoup-3.0-0<3.6.6-1ubuntu3.1
3.6.6-1ubuntu3.1
Ubuntu Ubuntu=26.10
All of the following
ubuntu/libsoup-3.0-common<3.6.6-1ubuntu3.1
3.6.6-1ubuntu3.1
Ubuntu Ubuntu=26.10
All of the following
ubuntu/libsoup-3.0-dev<3.6.6-1ubuntu3.1
3.6.6-1ubuntu3.1
Ubuntu Ubuntu=26.10
All of the following
ubuntu/gir1.2-soup-2.4<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=26.04
All of the following
ubuntu/gir1.2-soup-3.0<3.6.6-1ubuntu0.2
3.6.6-1ubuntu0.2
Ubuntu Ubuntu=26.04
All of the following
ubuntu/libsoup-2.4-1<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=26.04
All of the following
ubuntu/libsoup-3.0-0<3.6.6-1ubuntu0.2
3.6.6-1ubuntu0.2
Ubuntu Ubuntu=26.04
All of the following
ubuntu/libsoup-3.0-common<3.6.6-1ubuntu0.2
3.6.6-1ubuntu0.2
Ubuntu Ubuntu=26.04
All of the following
ubuntu/libsoup-3.0-dev<3.6.6-1ubuntu0.2
3.6.6-1ubuntu0.2
Ubuntu Ubuntu=26.04
All of the following
ubuntu/libsoup-gnome-2.4-1<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=26.04
All of the following
ubuntu/libsoup-gnome2.4-dev<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=26.04
All of the following
ubuntu/libsoup2.4-common<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=26.04
All of the following
ubuntu/libsoup2.4-dev<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=26.04
All of the following
ubuntu/gir1.2-soup-2.4<2.74.3-6ubuntu1.10
2.74.3-6ubuntu1.10
Ubuntu Ubuntu=24.04
All of the following
ubuntu/gir1.2-soup-3.0<3.4.4-5ubuntu0.10
3.4.4-5ubuntu0.10
Ubuntu Ubuntu=24.04
All of the following
ubuntu/libsoup-2.4-1<2.74.3-6ubuntu1.10
2.74.3-6ubuntu1.10
Ubuntu Ubuntu=24.04
All of the following
ubuntu/libsoup-3.0-0<3.4.4-5ubuntu0.10
3.4.4-5ubuntu0.10
Ubuntu Ubuntu=24.04
All of the following
ubuntu/libsoup-3.0-common<3.4.4-5ubuntu0.10
3.4.4-5ubuntu0.10
Ubuntu Ubuntu=24.04
All of the following
ubuntu/libsoup-3.0-dev<3.4.4-5ubuntu0.10
3.4.4-5ubuntu0.10
Ubuntu Ubuntu=24.04
All of the following
ubuntu/libsoup-gnome-2.4-1<2.74.3-6ubuntu1.10
2.74.3-6ubuntu1.10
Ubuntu Ubuntu=24.04
All of the following
ubuntu/libsoup-gnome2.4-dev<2.74.3-6ubuntu1.10
2.74.3-6ubuntu1.10
Ubuntu Ubuntu=24.04
All of the following
ubuntu/libsoup2.4-common<2.74.3-6ubuntu1.10
2.74.3-6ubuntu1.10
Ubuntu Ubuntu=24.04
All of the following
ubuntu/libsoup2.4-dev<2.74.3-6ubuntu1.10
2.74.3-6ubuntu1.10
Ubuntu Ubuntu=24.04
All of the following
ubuntu/gir1.2-soup-2.4<2.74.2-3ubuntu0.10
2.74.2-3ubuntu0.10
Ubuntu Ubuntu=22.04
All of the following
ubuntu/gir1.2-soup-3.0<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=22.04
All of the following
ubuntu/libsoup-3.0-0<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=22.04
All of the following
ubuntu/libsoup-3.0-common<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=22.04
All of the following
ubuntu/libsoup-3.0-dev<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=22.04
All of the following
ubuntu/libsoup-gnome2.4-1<2.74.2-3ubuntu0.10
2.74.2-3ubuntu0.10
Ubuntu Ubuntu=22.04
All of the following
ubuntu/libsoup-gnome2.4-dev<2.74.2-3ubuntu0.10
2.74.2-3ubuntu0.10
Ubuntu Ubuntu=22.04
All of the following
ubuntu/libsoup2.4-1<2.74.2-3ubuntu0.10
2.74.2-3ubuntu0.10
Ubuntu Ubuntu=22.04
All of the following
ubuntu/libsoup2.4-common<2.74.2-3ubuntu0.10
2.74.2-3ubuntu0.10
Ubuntu Ubuntu=22.04
All of the following
ubuntu/libsoup2.4-dev<2.74.2-3ubuntu0.10
2.74.2-3ubuntu0.10
Ubuntu Ubuntu=22.04
All of the following
ubuntu/gir1.2-soup-2.4<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=20.04
All of the following
ubuntu/libsoup-gnome2.4-1<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=20.04
All of the following
ubuntu/libsoup-gnome2.4-dev<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=20.04
All of the following
ubuntu/libsoup2.4-1<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=20.04
All of the following
ubuntu/libsoup2.4-dev<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=20.04
All of the following
ubuntu/gir1.2-soup-2.4<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=18.04
All of the following
ubuntu/libsoup-gnome2.4-1<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=18.04
All of the following
ubuntu/libsoup-gnome2.4-dev<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=18.04
All of the following
ubuntu/libsoup2.4-1<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=18.04
All of the following
ubuntu/libsoup2.4-dev<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=18.04
All of the following
ubuntu/gir1.2-soup-2.4<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=16.04
All of the following
ubuntu/libsoup-gnome2.4-1<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=16.04
All of the following
ubuntu/libsoup-gnome2.4-dev<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=16.04
All of the following
ubuntu/libsoup2.4-1<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=16.04
All of the following
ubuntu/libsoup2.4-dev<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=16.04

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade ubuntu/libsoup2.4 to a version that resolves this vulnerability.

    Fixed in 2.52.2-1ubuntu0.3+esm9
  2. Upgrade

    Upgrade ubuntu/libsoup2.4 to a version that resolves this vulnerability.

    Fixed in 2.62.1-1ubuntu0.4+esm10
  3. Upgrade

    Upgrade ubuntu/libsoup2.4 to a version that resolves this vulnerability.

    Fixed in 2.70.0-1ubuntu0.5+esm5
  4. Upgrade

    Upgrade ubuntu/libsoup2.4 to a version that resolves this vulnerability.

    Fixed in 2.74.2-3ubuntu0.10
  5. Upgrade

    Upgrade ubuntu/libsoup3 to a version that resolves this vulnerability.

    Fixed in 3.0.7-0ubuntu1+esm10
  6. Upgrade

    Upgrade ubuntu/libsoup2.4 to a version that resolves this vulnerability.

    Fixed in 2.74.3-6ubuntu1.10
  7. Upgrade

    Upgrade ubuntu/libsoup3 to a version that resolves this vulnerability.

    Fixed in 3.4.4-5ubuntu0.10
  8. Upgrade

    Upgrade ubuntu/libsoup3 to a version that resolves this vulnerability.

    Fixed in 3.6.6-1ubuntu3.1
  9. Upgrade

    Upgrade ubuntu/libsoup3 to a version that resolves this vulnerability.

    Fixed in 3.6.6-1ubuntu0.2
  10. Upgrade

    Upgrade ubuntu/libsoup2.4 to a version that resolves this vulnerability.

    Fixed in 2.74.3-10.1ubuntu5+esm4
  11. Upgrade

    Upgrade ubuntu/gir1.2-soup-3.0 to a version that resolves this vulnerability.

    Fixed in 3.6.6-1ubuntu3.1
  12. Upgrade

    Upgrade ubuntu/libsoup-3.0-0 to a version that resolves this vulnerability.

    Fixed in 3.6.6-1ubuntu3.1
  13. Upgrade

    Upgrade ubuntu/libsoup-3.0-common to a version that resolves this vulnerability.

    Fixed in 3.6.6-1ubuntu3.1
  14. Upgrade

    Upgrade ubuntu/libsoup-3.0-dev to a version that resolves this vulnerability.

    Fixed in 3.6.6-1ubuntu3.1
  15. Upgrade

    Upgrade ubuntu/gir1.2-soup-2.4 to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  16. Upgrade

    Upgrade ubuntu/gir1.2-soup-3.0 to a version that resolves this vulnerability.

    Fixed in 3.6.6-1ubuntu0.2
  17. Upgrade

    Upgrade ubuntu/libsoup-2.4-1 to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  18. Upgrade

    Upgrade ubuntu/libsoup-3.0-0 to a version that resolves this vulnerability.

    Fixed in 3.6.6-1ubuntu0.2
  19. Upgrade

    Upgrade ubuntu/libsoup-3.0-common to a version that resolves this vulnerability.

    Fixed in 3.6.6-1ubuntu0.2
  20. Upgrade

    Upgrade ubuntu/libsoup-3.0-dev to a version that resolves this vulnerability.

    Fixed in 3.6.6-1ubuntu0.2
  21. Upgrade

    Upgrade ubuntu/libsoup-gnome-2.4-1 to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  22. Upgrade

    Upgrade ubuntu/libsoup-gnome2.4-dev to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  23. Upgrade

    Upgrade ubuntu/libsoup2.4-common to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  24. Upgrade

    Upgrade ubuntu/libsoup2.4-dev to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  25. Upgrade

    Upgrade ubuntu/gir1.2-soup-2.4 to a version that resolves this vulnerability.

    Fixed in 2.74.3-6ubuntu1.10
  26. Upgrade

    Upgrade ubuntu/gir1.2-soup-3.0 to a version that resolves this vulnerability.

    Fixed in 3.4.4-5ubuntu0.10
  27. Upgrade

    Upgrade ubuntu/libsoup-2.4-1 to a version that resolves this vulnerability.

    Fixed in 2.74.3-6ubuntu1.10
  28. Upgrade

    Upgrade ubuntu/libsoup-3.0-0 to a version that resolves this vulnerability.

    Fixed in 3.4.4-5ubuntu0.10
  29. Upgrade

    Upgrade ubuntu/libsoup-3.0-common to a version that resolves this vulnerability.

    Fixed in 3.4.4-5ubuntu0.10
  30. Upgrade

    Upgrade ubuntu/libsoup-3.0-dev to a version that resolves this vulnerability.

    Fixed in 3.4.4-5ubuntu0.10
  31. Upgrade

    Upgrade ubuntu/libsoup-gnome-2.4-1 to a version that resolves this vulnerability.

    Fixed in 2.74.3-6ubuntu1.10
  32. Upgrade

    Upgrade ubuntu/libsoup-gnome2.4-dev to a version that resolves this vulnerability.

    Fixed in 2.74.3-6ubuntu1.10
  33. Upgrade

    Upgrade ubuntu/libsoup2.4-common to a version that resolves this vulnerability.

    Fixed in 2.74.3-6ubuntu1.10
  34. Upgrade

    Upgrade ubuntu/libsoup2.4-dev to a version that resolves this vulnerability.

    Fixed in 2.74.3-6ubuntu1.10
  35. Upgrade

    Upgrade ubuntu/gir1.2-soup-2.4 to a version that resolves this vulnerability.

    Fixed in 2.74.2-3ubuntu0.10
  36. Upgrade

    Upgrade ubuntu/gir1.2-soup-3.0 to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  37. Upgrade

    Upgrade ubuntu/libsoup-3.0-0 to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  38. Upgrade

    Upgrade ubuntu/libsoup-3.0-common to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  39. Upgrade

    Upgrade ubuntu/libsoup-3.0-dev to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  40. Upgrade

    Upgrade ubuntu/libsoup-gnome2.4-1 to a version that resolves this vulnerability.

    Fixed in 2.74.2-3ubuntu0.10
  41. Upgrade

    Upgrade ubuntu/libsoup-gnome2.4-dev to a version that resolves this vulnerability.

    Fixed in 2.74.2-3ubuntu0.10
  42. Upgrade

    Upgrade ubuntu/libsoup2.4-1 to a version that resolves this vulnerability.

    Fixed in 2.74.2-3ubuntu0.10
  43. Upgrade

    Upgrade ubuntu/libsoup2.4-common to a version that resolves this vulnerability.

    Fixed in 2.74.2-3ubuntu0.10
  44. Upgrade

    Upgrade ubuntu/libsoup2.4-dev to a version that resolves this vulnerability.

    Fixed in 2.74.2-3ubuntu0.10
  45. Upgrade

    Upgrade ubuntu/libsoup-gnome2.4-1 to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  46. Upgrade

    Upgrade ubuntu/libsoup2.4-1 to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro

Event History

Nov 3, 2026
Advisory Published
via Ubuntu·12:00 AM
Data Sourced
via Ubuntu·12:00 AM
DescriptionAffected Software
Advisory Published
via OSV·04:06 PM
Data Sourced
via OSV·04:06 PM
DescriptionAffected Software

Child vulnerabilities

Contains the following vulnerabilities.

Frequently Asked Questions

1

Which of the listed issues can expose sensitive information, rather than only crash an application?

CVE-2026-12478, involving certain WebSocket frames, and CVE-2026-102555, involving certain data URIs, may cause either an application crash or exposure of sensitive information. The described WebSocket message and fragmented-message issues are identified as crash risks.

2

Are Ubuntu 18.04 LTS and Ubuntu 20.04 LTS affected by every issue described?

The notice explicitly identifies Ubuntu 18.04 LTS and Ubuntu 20.04 LTS as affected by CVE-2026-102556, the WebSocket message handling issue. The data URI and certain WebSocket-frame issues are explicitly limited to Ubuntu 22.04 LTS, 24.04 LTS, 26.04 LTS, and 26.10.

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