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CVE-2026-71554VulnerabilityPublished Updated

SUSE · Security update for python-h2

Affects SUSESource GCVE Database

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Authoritative record:CVE-2026-71554· Medium 5.3

Not known to be exploited · CVSS 5.3 Medium : upgrade SUSE h2 to 4.4.1 when convenient.

Data as of 10 Nov 2026, 20:06 UTC

CVSS 3.1 base score
5.3Medium
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 4.4.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 6 Aug 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 10 Nov 2026.

What to do

Upgrade h2 to 4.4.1.

Affected software

ProductAffectedFixed in
python-hyperh2Affected
  • <4.4.1
Fixed in
  • 4.4.1
PyPIh2pkg:pypi/h2Other threatsAffected
  • <=4.4.0
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

Description

This update for python-h2 fixes the following issue: - CVE-2026-71554: duplicate `Host` headers are accepted and forwarded to consuming applications, which can lead to request smuggling (bsc#1274386).

References

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