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Highest advisory severityCritical 2 vendors · 2 advisories

CVE-2026-93479

vulnerability exists in NGINX Plus and NGINX Open Source when a map directive uses regex matching and the root directive or access log format references the map's regex capture variables before referencing the map output variable

CVE-2026-93479: vulnerability exists in NGINX Plus and NGINX Open Source when a map directive uses regex matching and the root directive or access log format…

Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.

NVD detail CVE.org

CVE-2026-93479 at a glance

CISA KEV
Not listed (catalog checked )
Highest advisory severity
Critical
CVSS base score
9.2 (F5), 7 (Red Hat)
Weakness
CWE-122
Fixed releases
  • F5: 37.1.0.1, 37.0.5.1, 1.31.7, 1.30.6
Vendor advisories
2 from F5, Red Hat
VulniPulse record
Published · Updated

Scores, vectors, weaknesses and fixed releases are quoted from vendor advisories that cover only CVE-2026-93479; bulletin-wide values are not repeated here.

Is CVE-2026-93479 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-93479 is not in the CISA KEV catalog (checked ) and no tracked advisory for it reports exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-93479?

Upgrade to a fixed release named by the vendor:

  • F5: 37.1.0.1, 37.0.5.1, 1.31.7, 1.30.6
  • To mitigate this vulnerability, do not use unnamed captures. Use named captures instead and only use them in the same block with the regex match. Red Hat recommends updating nginx to the latest version when a fix is available. (Red Hat)

Vendor advisory comparison

F5

1 advisory
  • Advisory severityCritical9.2

    Critical [CVE-2026-93479] vulnerability exists in NGINX Plus and NGINX Open Source when a map directive uses regex matching and the root directive or access log format references the map's regex capture variables before referencing the map output variable

    CVE-2026-93479Source published Source updated

    A vulnerability exists in NGINX Plus and NGINX Open Source when a map directive uses regex matching and the root directive or access log format references the map's regex capture variables before referencing the map output variable. Alternatively, the same result could be achieved by using a non-cacheable variable in a string expression under certain conditions. An unauthenticated attacker along with conditions beyond their control can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap buffer overflow in the NGINX worker process leading to a restart. Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR. Impact: This vulnerability may allow remote attackers to cause…

    Affected products in this advisory
    • NGINX Plus
    • NGINX Open Source
    Source-reported affected versions
    • NGINX Plus 37.1.0 before 37.1.0.1
    • NGINX Plus 37.0.0 before 37.0.5.1
    • NGINX Plus R36
    • NGINX Plus R35

    4 more entries in the full advisory.

    Source-reported fixed versions
    • 37.1.0.1
    • 37.0.5.1
    • 1.31.7
    • 1.30.6
    Mitigation guidance
    No mitigation guidance extracted; consult the source.
    Full advisory and evidenceOpen source bulletin

Red Hat

1 advisory
  • Advisory severityHigh7.0

    High [CVE-2026-93479] NGINX map directive and regex matching vulnerability

    CVE-2026-93479Source published Source updated

    NGINX map directive and regex matching vulnerability. Red Hat rates this important (CVSS 7). Weakness: CWE-122.

    Related products — impact not confirmed
    No product details extracted. Check the source bulletin.
    Source-reported affected versions
    Affected-version details not available in this record.
    Source-reported fixed versions
    No fixed-version detail extracted. This does not mean no fix exists.
    Mitigation guidance
    • To mitigate this vulnerability, do not use unnamed captures. Use named captures instead and only use them in the same block with the regex match. Red Hat recommends updating nginx to the latest version when a fix is available.
    Full advisory and evidenceOpen source bulletin

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