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CVE-2026-6324

MEDIUM 4.8 ALL-YEARS

Published 2026-05-29 · Last modified 2026-05-29 · redhat · NVD: Awaiting Analysis

A flaw was found in libsoup. A remote attacker could exploit an unsigned to signed conversion error in the `soup_body_input_stream_read_chunked()` function by sending a malicious HTTP request. This vulnerability occurs when libsoup operates behind a non-libsoup proxy server or as a proxy in front of a non-libsoup backend server. Successful exploitation can allow an attacker to bypass security controls, poison web caches, or gain unauthorized access.

LIMITED SIGNALS

No known exploitation, public exploit, or elevated probability at this time. Track for changes.

Exploitation likelihood

0.9%chance of exploitation in 30 days · 59th percentile

○ In CISA KEV○ Catalogued PoC◆ SSVC: exploitation poc, automatable no

Impact if exploited

4.8CVSS 3.1 · MEDIUM · CNA

  • ConfidentialityLow
  • IntegrityLow
  • AvailabilityNone

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ✓Privileges: No account or privileges required
  • ✓User interaction: No user interaction needed
  • ⚠Complexity: Needs a race window or specific setup

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

No public PoC is currently catalogued.

Search for new PoCs

Search GitHub now — results may be empty or unverified.

Tracked sources are checked weekly for the full archive, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.

Data snapshot:

Affected

Vendors Red Hat

Products Red Hat Enterprise Linux 10 Red Hat Enterprise Linux 6 Red Hat Enterprise Linux 7 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 9

Weakness (CWE)

  • CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

References and research data (JSON)

Vendor product assessments

  • libsoup3 as a component of Red Hat Enterprise Linux 10 · under investigation

    Vendor assessment for this product only.

    pkg:rpm/redhat/libsoup3

    Red Hat · CVE-2026-6324 · Updated 2026-07-02T15:16:55+00:00
  • libsoup3-devel as a component of Red Hat Enterprise Linux 10 · under investigation

    Vendor assessment for this product only.

    pkg:rpm/redhat/libsoup3-devel

    Red Hat · CVE-2026-6324 · Updated 2026-07-02T15:16:55+00:00
  • libsoup3-doc as a component of Red Hat Enterprise Linux 10 · under investigation

    Vendor assessment for this product only.

    pkg:rpm/redhat/libsoup3-doc

    Red Hat · CVE-2026-6324 · Updated 2026-07-02T15:16:55+00:00
  • libsoup3.src as a component of Red Hat Enterprise Linux 10 · under investigation

    Vendor assessment for this product only.

    pkg:rpm/redhat/libsoup3?arch=src

    Red Hat · CVE-2026-6324 · Updated 2026-07-02T15:16:55+00:00
  • libsoup as a component of Red Hat Enterprise Linux 6 · under investigation

    Vendor assessment for this product only.

    pkg:rpm/redhat/libsoup

    Red Hat · CVE-2026-6324 · Updated 2026-07-02T15:16:55+00:00
  • libsoup-devel as a component of Red Hat Enterprise Linux 6 · under investigation

    Vendor assessment for this product only.

    pkg:rpm/redhat/libsoup-devel

    Red Hat · CVE-2026-6324 · Updated 2026-07-02T15:16:55+00:00
  • libsoup.src as a component of Red Hat Enterprise Linux 6 · under investigation

    Vendor assessment for this product only.

    pkg:rpm/redhat/libsoup?arch=src

    Red Hat · CVE-2026-6324 · Updated 2026-07-02T15:16:55+00:00
  • libsoup as a component of Red Hat Enterprise Linux 7 · under investigation

    Vendor assessment for this product only.

    pkg:rpm/redhat/libsoup

    Red Hat · CVE-2026-6324 · Updated 2026-07-02T15:16:55+00:00
  • libsoup-devel as a component of Red Hat Enterprise Linux 7 · under investigation

    Vendor assessment for this product only.

    pkg:rpm/redhat/libsoup-devel

    Red Hat · CVE-2026-6324 · Updated 2026-07-02T15:16:55+00:00
  • libsoup.src as a component of Red Hat Enterprise Linux 7 · under investigation

    Vendor assessment for this product only.

    pkg:rpm/redhat/libsoup?arch=src

    Red Hat · CVE-2026-6324 · Updated 2026-07-02T15:16:55+00:00
  • libsoup as a component of Red Hat Enterprise Linux 8 · under investigation

    Vendor assessment for this product only.

    pkg:rpm/redhat/libsoup

    Red Hat · CVE-2026-6324 · Updated 2026-07-02T15:16:55+00:00
  • libsoup-devel as a component of Red Hat Enterprise Linux 8 · under investigation

    Vendor assessment for this product only.

    pkg:rpm/redhat/libsoup-devel

    Red Hat · CVE-2026-6324 · Updated 2026-07-02T15:16:55+00:00
  • libsoup.src as a component of Red Hat Enterprise Linux 8 · under investigation

    Vendor assessment for this product only.

    pkg:rpm/redhat/libsoup?arch=src

    Red Hat · CVE-2026-6324 · Updated 2026-07-02T15:16:55+00:00
  • libsoup as a component of Red Hat Enterprise Linux 9 · under investigation

    Vendor assessment for this product only.

    pkg:rpm/redhat/libsoup

    Red Hat · CVE-2026-6324 · Updated 2026-07-02T15:16:55+00:00
  • libsoup-devel as a component of Red Hat Enterprise Linux 9 · under investigation

    Vendor assessment for this product only.

    pkg:rpm/redhat/libsoup-devel

    Red Hat · CVE-2026-6324 · Updated 2026-07-02T15:16:55+00:00
  • libsoup.src as a component of Red Hat Enterprise Linux 9 · under investigation

    Vendor assessment for this product only.

    pkg:rpm/redhat/libsoup?arch=src

    Red Hat · CVE-2026-6324 · Updated 2026-07-02T15:16:55+00:00

All CVSS metrics

  • MEDIUM 4.8 v3.1 · CNA Primary
    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
  • MEDIUM 4.8 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

References

Exploit-tagged references (not proof of a PoC)

Advisories

Technical & other

Sources: NVD · CVE.org · All sources and attribution · EPSS