Vulnerability · Published Jul 17, 2026 · Assigned by GitHub_M

CVE-2026-50197Skipper: opaAuthorizeRequestWithBody filter bypasses OPA policy on Transfer-Encoding: chunked / HTTP/2 requests

High 7.8

In plain English

A high-severity security flaw in skipper from zalando. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 44% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)7.8High

Exploit odds (30 days)0.5%top 56.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Skipper is an HTTP router and reverse proxy for service composition. Prior to 0.26.10, zalando/skipper's OpenPolicyAgent integration silently bypasses request-body inspection on HTTP/1.1 Transfer-Encoding: chunked and HTTP/2 requests that omit the content-length pseudo-header, because the opaAuthorizeRequestWithBody filter and OpenPolicyAgentInstance.ExtractHttpBodyOptionally in filters/openpolicyagent/openpolicyagent.go produce an empty raw_body and input.parsed_body while the upstream service receives the full attacker-controlled body. This issue is fixed in version 0.26.10.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/zalando/skipper	0.26.10	GHSA-659f-rgp5-w4wf
Go	github.com/zalando/skipper	0.26.10	GO-2026-5944

Affected products (as reported)

Vendor	Product	Versions
zalando	skipper	< 0.26.10

Weakness: CWE-444 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N

References

https://github.com/zalando/skipper/security/advisories/GHSA-659f-rgp5-w4wf x_refsource_CONFIRM
https://github.com/zalando/skipper/pull/4041 x_refsource_MISC
https://github.com/zalando/skipper/commit/3152f3b0bb52ca89c3564be42434db0a2a1cea23 x_refsource_MISC
https://github.com/zalando/skipper/releases/tag/v0.26.10 x_refsource_MISC