CVE-2006-5876: The soup_headers_parse function in soup-headers.c for libsoup HTTP library before 2.2.99 allows remote attacke

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HIGH 7.8DOWNGRADE

CVE-2006-5876 is a high-severity flaw (CVSS 7.8) affecting libsoup. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The soup_headers_parse function in soup-headers.c for libsoup HTTP library before 2.2.99 allows remote attackers to cause a denial of service (crash) via malformed HTTP headers, probably involving missing fields or values.

Why this priority

High severity

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.8 (High)
EPSS exploit chance	2.8% (top 14%)
CISA exploited list	No
Published	2007-01-16
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: libsoup

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2007-01-16 19:28 UTCPublished CVE record published
2026-06-16 22:32 UTCUpdated Record last modified

libsoup libsoup DOWNGRADE

Affected: 2.2.98

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.2.98

1. Check installed version

apt-cache policy libsoup || rpm -q libsoup || libsoup --version

2. No fixed release: DOWNGRADE to a release before 2.2.98 (Debian / Ubuntu)

apt-cache madison libsoup sudo apt install libsoup=<VERSION_BEFORE_2.2.98> sudo apt-mark hold libsoup

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list libsoup sudo dnf downgrade libsoup-<VERSION_BEFORE_2.2.98> sudo dnf versionlock add libsoup

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2006-5876?

libsoup: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2006-5876 being exploited?

CVE-2006-5876 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2006-5876 affect?

CVE-2006-5876 affects libsoup. Severity is high (CVSS 7.8). The soup_headers_parse function in soup-headers.c for libsoup HTTP library before 2.2.99 allows remote attackers to cause a denial of service (crash) via malformed HTTP headers, probably involving missing fields or values.

How urgent is CVE-2006-5876?

Priority 49/100. High severity

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References

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