HAProxy known bugs for version v2.6.30 (maintenance branch 2.6) :  34 

This version (2.6.30) is a release belonging to maintenance branch 2.6 whose latest version is 2.6.32. If your version is not the last one in the maintenance branch, you are missing fixes for known bugs, and by not updating you are needlessly taking the responsibility for the risk of unexpected service outages and exposing your web site to possible security issues.

The HAProxy development team takes a great care of maintaining stable versions so that all users can apply bug fixes without having to take the risk of upgrading to a new branch. In turn users are expected to apply the fixes when the development team estimates that they were worth being backported to stable branches.

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Other versions in the same branch

This branch contains the following releases :

DateVersionComment
2026-07-292.6.32 ⇐ last
2026-07-032.6.31 
2026-06-262.6.30 ⇐ yours
2026-05-112.6.29 
2026-05-062.6.28 
2026-04-302.6.27 
2026-04-232.6.26 
2026-03-202.6.25 
2026-03-092.6.24 
2025-10-032.6.23 
2025-04-222.6.22 
2025-01-292.6.21 
2024-11-082.6.20 
2024-09-192.6.19 
2024-06-182.6.18 
2024-04-052.6.17 
2023-12-132.6.16 
2023-08-092.6.15 
2023-06-092.6.14 
2023-05-022.6.13 
2023-03-282.6.12 
2023-03-172.6.11 
2023-03-102.6.10 
2023-02-142.6.9 
2023-01-242.6.8 
2022-12-022.6.7 
2022-09-222.6.6 
2022-09-032.6.5 
2022-08-222.6.4 
2022-08-192.6.3 
2022-07-222.6.2 
2022-06-212.6.1 
2022-05-312.6.0 

Known bugs affecting this version, and already fixed in the maintenance branch

These fixes have already been queued for a more recent 2.6 version. Some of them might have already been released in a more recent version than yours, and other ones might still be pending in the maintenance branch for a future release. The list may be empty if you're already on the latest version and no new fix was backported.

Bugs are almost always tagged with a severity (some people forget the severity tag when the bug is minor). The following severities are used :

Total known bugs in this version by category :

TotalCRITICALMAJORMEDIUMMINOR
34 0 1 11 22

Click on the subjects below to get the full description of the bug :

Merge dateSubject - Severity (minor, medium, major, critical)
2026-07-29BUG/MEDIUM: sample: reject the deprecated protobuf group wire types
2026-07-29BUG/MEDIUM: peers: check the available room before encoding dict values
2026-07-29BUG/MINOR: slz: avoid undefined shifts when building the word byte by byte
2026-07-29BUG/MINOR: slz: fix the adler32 accumulators signedness on 32-bit
2026-07-29BUG/MINOR: slz: do not append a block to an already finished stream
2026-07-29BUG/MEDIUM: slz: bound the bits wasted by the 9-bit literals
2026-07-29BUG/MINOR: slz: use the exact switch cost for the last literals of a block
2026-07-29BUG/MINOR: slz: do not read past the end of the input around the match loop
2026-07-29BUG/MINOR: htx: Transfer HTX_FL_EOM flag on success in htx_append_msg()
2026-07-29BUG/MINOR: htx: Perform raw copy for messages of same size in htx_copy_msg()
2026-07-29BUG/MINOR: http-htx: check the strdup() of the "lf-string" http reply argument
2026-07-29BUG/MINOR: http-act: reject a negative capture id in the capture actions
2026-07-29BUG/MINOR: http-act: restore the response buffer state in the early-hint action
2026-07-29BUG/MINOR: http-act: fix a double free of the map reference on a parsing error
2026-07-29BUG/MINOR: http-act: fix a double free of the regex on a rule parsing error
2026-07-29BUG/MINOR: http-ana: fix a one-byte over-read in the client-side cookie parser
2026-07-29BUG/MINOR: h2: don't use a block pointer to roll back a partial HTX conversion
2026-07-29BUG/MINOR: http-htx: check the trash allocation in http_scheme_based_normalize()
2026-07-29BUG/MEDIUM: http-fetch: reject a negative capture id in capture.{req,res}.hdr
2026-07-29BUG/MEDIUM: http-fetch: don't parse a non-HTTP check buffer as an HTX message
2026-07-29BUG/MINOR: http-htx: fix the length moved when removing a header value
2026-07-22BUG/MEDIUM: sample: Adjust sample size capacity after pointer shift for ltrim()
2026-07-22BUG/MINOR: mux-h1: Don't delay send if message with c-l was fully sent
2026-07-22BUG/MEDIUM: protobuf: fix nested path bypass in field lookup
2026-07-22BUG/MEDIUM: protobuf: adjust sample size capacity after pointer shift
2026-07-22BUG/MEDIUM: ssl-gencert: Don't forget to free memory when done
2026-07-22BUG/MEDIUM: stats: Ensure that Origin is valid on POSTs
2026-07-22BUG/MEDIUM: stats: subject "stats admin" accesses to "stats scope" filtering
2026-07-22BUG/MINOR: http-conv: Make url-dec failed if no space for trailing null byte
2026-07-22BUG/MINOR: sample: Fix a possible underflow on be2hex for large chunk size
2026-07-02BUG/MINOR: http-htx: Don't by-pass HTX API when merging cookie values
2026-07-02BUG/MAJOR: htx: Don't swap buffers for empty HTX message with an error
2026-07-02BUG/MINOR: tools: fix invalid character detection in strl2ic()
2026-07-02BUG/MINOR: sample: set SMP_F_CONST on srv_name fetch

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