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Vulnerabilities

Vulnerability · CVE-2026-102558

A flaw was found in libsoup.

Published Sep 29, 2026 · catalog updated Oct 15, 2026 · A flaw was found

Check if you run it

No confirmed exploitation is on record for CVE-2026-102558. EPSS is 0.39%. Act only if a listed version of A flaw was found is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (A flaw was found).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.6
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.39%
Remediation
Advisory link
Affected products
cpe gnome/libsoup · cpe redhat/enterprise linux · vendor Red Hat Red Hat Enterprise Linux 10 · vendor Red Hat Red Hat Enterprise Linux 6 · vendor Red Hat Red Hat Enterprise Linux 7 · vendor Red Hat Red Hat Enterprise Linux 8

A flaw was found in libsoup. When max-incoming-payload-size is unlimited (0), SoupWebsocketConnection could grow its incoming GByteArray based on an attacker-controlled frame length until the length wrapped, causing a heap buffer overflow while reading frame data.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe gnome/libsoupversion unspecified
  • cpe redhat/enterprise linux10.0
  • cpe redhat/enterprise linux7.0
  • cpe redhat/enterprise linux8.0
  • cpe redhat/enterprise linux9.0
  • vendor Red Hat Red Hat Enterprise Linux 10version unspecified
  • vendor Red Hat Red Hat Enterprise Linux 6version unspecified
  • vendor Red Hat Red Hat Enterprise Linux 7version unspecified
  • vendor Red Hat Red Hat Enterprise Linux 8version unspecified
  • vendor Red Hat Red Hat Enterprise Linux 9version unspecified

How to fix CVE-2026-102558

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-102558. EPSS is 0.39%. Act only if a listed version of A flaw was found is installed.

Which versions are affected?

Compare what you have installed with redhat/enterprise linux 10.0; redhat/enterprise linux 7.0; redhat/enterprise linux 8.0; redhat/enterprise linux 9.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-125: Out-of-bounds Read. EPSS 0.39%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 29, 2026 · NIST NVD

    Detected

    A flaw was found in libsoup. When max-incoming-payload-size is unlimited (0), SoupWebsocketConnection could grow its incoming GByteArray based on an attacker-controlled frame length until the length wrapped, causing a heap buffer overflow while reading frame data.

  2. Oct 15, 2026 · NIST NVD

    Updated

    A flaw was found in libsoup. When max-incoming-payload-size is unlimited (0), SoupWebsocketConnection could grow its incoming GByteArray based on an attacker-controlled frame length until the length wrapped, causing a heap buffer overflow while reading frame data.

  3. Oct 15, 2026 · NIST NVD

    Updated

    A flaw was found in libsoup. When max-incoming-payload-size is unlimited (0), SoupWebsocketConnection could grow its incoming GByteArray based on an attacker-controlled frame length until the length wrapped, causing a heap buffer overflow while reading frame data.

  4. Oct 15, 2026 · NIST NVD

    Updated

    A flaw was found in libsoup. When max-incoming-payload-size is unlimited (0), SoupWebsocketConnection could grow its incoming GByteArray based on an attacker-controlled frame length until the length wrapped, causing a heap buffer overflow while reading frame data.

Sources

  • CIRCL Vulnerability LookupVulnerability recordCVE-2026-102558

    A flaw was found in libsoup. When max-incoming-payload-size is unlimited (0), SoupWebsocketConnection could grow its incoming GByteArray based on an attacker-controlled frame length until the length wrapped, causing a heap buffer overflow while reading frame data.

    vulnerability.circl.lu
  • CVE.orgVulnerability recordCVE-2026-102558

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-102558

    30-day exploitation probability 0.4%

    first.org
  • JVN iPediaGovernment advisoryCVE-2026-102558

    libsoupに脆弱性が発見されました。max-incoming-payload-sizeが無制限（0）に設定されている場合、SoupWebsocketConnectionは攻撃者が制御するフレーム長に基づいて受信するGByteArrayのサイズを拡大し続け、その長さがオーバーフロー（ラップアラウンド）するまで増加します。その結果、フレームデータの読み取り中にヒープバッファオーバーフローが発生します。

    jvndb.jvn.jp
  • NIST NVDVulnerability recordCVE-2026-102558

    A flaw was found in libsoup. When max-incoming-payload-size is unlimited (0), SoupWebsocketConnection could grow its incoming GByteArray based on an attacker-controlled frame length until the length wrapped, causing a heap buffer overflow while reading frame data.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.